Hillary Clinton’s 2008 presidential campaign got more than $50,000 from employees of an accounting firm federal prosecutors called an “assembly line for illegal campaign contributions,” according to a new report.

The employees, two of whom pleaded guilty last month to making straw donations, made more than $514,000 in contributions to federal candidates and committees over the past 10 years, the Center for Public Integrity found in a report out Friday.

Of the $50,000 to Clinton’s campaign, more than $40,000 came from November 2007, when she attended a fundraiser at the company’s headquarters, CPI reported.

President Barack Obama and Sen. John McCain both received about $14,000 from the employees in the 2008 cycle, and Sen. Harry Reid received nearly $10,000.

“For a decade, the firm and its CEO made illegal campaign contributions through straw donors to an array of federal and D.C. politicians. The firm used a special accounting system to keep track of the thousands and thousands of dollars it was plowing into political campaigns,” said U.S. Attorney Ron Machen in a statement announcing last month’s guilty plea. He said the plea showed how a “D.C. accounting firm was converted into an assembly line for illegal campaign contributions.”

According to prosecutors, from 2002 to 2011, the employees used the names of relatives to disguise contributions from the company and its former executive. That executive left the firm last year but has not been charged with any crimes.

CPI said a spokesman for Clinton did not respond to their requests for comment.